Finding the Fourth Proportional to 2,642.49, 3,964.79 and 999.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.49 : 3,964.79 = 999.50 : x
2. Step 2: Convert to fraction form
   2,642.49/3,964.79 = 999.50/x
3. Step 3: Cross multiply
   2,642.49x = 3,964.79 × 999.50
4. Step 4: Simplify right side
   2,642.49x = 3,962,782.78
5. Step 5: Solve for x
   x = 3,962,782.78/2,642.49
6. Step 6: Final answer
   x = 1,499.64